BBPCSR_WRITE_CONTROL
rt2x00_set_field32(®, BBPCSR_WRITE_CONTROL, 1);
rt2x00_set_field32(®, BBPCSR_WRITE_CONTROL, 0);
rt2x00_set_field32(®, BBPCSR_WRITE_CONTROL, 1);
rt2x00_set_field32(®, BBPCSR_WRITE_CONTROL, 0);